Targeting Firefox Exclusively with CSS

Conditional comments in CSS conveniently allow for targeting Internet Explorer with browser-specific rules. However, what if the objective is to exclusively target Firefox while leaving other browsers unaffected?

A Clean and Browser-Centric Approach

Rather than resorting to JavaScript or browser sniffing, a more elegant solution lies in using Mozilla's "-moz-document" CSS property. This property enables conditional CSS rules that are applied only within Gecko-based browsers like Firefox.

Syntax and Example

The syntax for targeting Firefox exclusively is:

@-moz-document url-prefix() {
  /* Firefox-specific CSS rules here... */
}

For instance, to make all

tags red in Firefox but leave them unaffected in other browsers:

@-moz-document url-prefix() {
  h1 {
    color: red;
  }
}

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This approach ensures that the rule is applied only to Firefox without affecting any other browser. By utilizing browser capabilities, this method offers a clean and browser-specific solution.

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